As you may know, my bevel box failed on my first ride out, with just 164 miles on the clock. It did sound like it had no oil inside, but there was no leak. Up until failing it was reasonably quiet.
The replacement bevel box has been fine and when I took the M3W in for first service the bevel box oil was changed. Although the M3W handbook says it is essential to replace the bevel box oil every 100,000 miles or 5 years, dealers have now been advised to change the oil at every service. In addition my drive belt was lubricated and I must admit, the car did sound a bit quieter than before its service.
